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FLUID MECHANICS

机译:流体力学

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This paper discusses the hydrodynamic and thermal behaviours of a fully developed mixed convective flow of a viscous incompressible heat generating/absorbing fluid in a vertical tube filled with isotropic porous material having time-periodic boundary condition. The dimensionless governing equations of motion and energy subjected to the Boussinesq approximation and asymmetric heat conditions are solved analytically. Closed-form solutions are expressed in terms of modified Bessel function of first kind. The solutions obtained are graphically represented, and the effects of the dimensionless heat generation/absorption H, the dimensionless frequency (Formula presented.) and the Darcy number Da on the fluid flow are investigated. It is discovered that velocity is maximum at two different locations in the flow domain, one near the surface of the tube and another at the axis of the tube. The presence of the heat generation parameter is seen to enhance the temperature distribution and this is reflected as increase in the magnitude of the oscillation dimensionless velocity, whereas in the presence of heat absorption a reversed trend occurs.
机译:本文讨论了在充满时间周期边界条件的各向同性多孔材料的垂直管中,粘性不可压缩生热/吸收流体的完全发展的混合对流的流体动力学和热行为。解析了经过Boussinesq逼近和不对称热条件的无量纲运动和能量控制方程。封闭形式的解决方案用第一类经过修改的贝塞尔函数表示。用图形表示获得的解,并研究了无因次生热/吸收H,无因次频率(公式)和达西数Da对流体流动的影响。发现在流域中的两个不同位置处,速度最大,一个在管子表面附近,另一个在管子轴线上。可以看出,存在发热参数会增强温度分布,这反映为无量纲振荡速度的幅度增加,而在存在热量吸收的情况下,会出现相反的趋势。

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  • 来源
    《Oceanographic Literature Review》 |2016年第4期|906-920|共15页
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  • 正文语种 eng
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